Data used to be stored both in memory and disk (db). This commits modifies the Watcher, Responder and Cleaner so they only keep the needed maps and load information from disk when necessary.
The Watcher used to receive a secret key file path ion the __init__ to load a secret key for signing. That made testing the Watcher hard, since the file needed to be present. Changing it so the main (pisad) loads the file from disk and passes the data the Watcher on init.
We were passing some unnecessary parameters to the Cleaner (locator) that could be derived from other data (uuid and appointments). Also standarises the order of the parameters to match the rest of the methods
- All encryption/decryption and signing/verifying calls are performed by the cryptographer now.
- The current signature format is temporal. We should define something not base on json.
- Some Cryptographer tests are still missing.
- The cli tests should be modified to fit this too.
Brings back check_potential_matches and check_matches to the Watcher.
The methods have now been renamed to check_matches (old check_potential_matches) and filter_valid_matches (old check_matches) to provide a better description of their purpose.
decode_raw_transaction has been added to BlockProcessor
The difference between master and the old data-persistence branch was huge, seems more effective to manually cherry pick the changes and integrate them
The decryption for the `EncryptedBlob` using AES-GCM-128 (the only cipher available atm) raises an `InvalidTag` exception. This was not properly captured by the watcher making it crash. This behavior was already discovered during the `EncryptedBlob` unit testing and left to be fixed in the `Watcher` unit testing.
However, making the EncryptedBlob raise such an exception may not be a good practice, since other ciphers may run into different exceptions. Therefore, the `EncryptedBlob` has been modified to return None upon facing a decryption issue, the `BlockProcessor` will detect that and return a None justice_txm and justice_txid. Upon receiving a None `justice_txid` the `Watcher` will delete the appointment without notifiying the `Responder`.
